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Wisconsin Engines Single cylinder up to V4 engines.

Wisconsin Engines

Vh4d vs W4-1770


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  #1  
Old 06-22-2019, 02:09:04 PM
IndianaDundee IndianaDundee is offline
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Default Vh4d vs W4-1770

I have a Vh4d in a skid steer with a cracked cylinder block that I just rebuilt. Then it blew the head gasket and the block cracked. I must have missed a micro crack when I built it and it expanded once I loaded it up.

I bought a W4-1770 for parts and on tearing it down it is much cleaner than the Vh4d was. I was planning on just swapping the jug to get the skid steer going but am now wondering if I should rebuilt the W4 instead.

I was under the impression that they were the same engine as the parts interchange but I noticed that the W4 is listed as a 35 hp and the Vh4d is 30. Is there actually a difference like larger valves or cam? Or is it just a marketing ploy of measuring the power differently?
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Old 06-22-2019, 03:09:47 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Vh4d vs W4-1770

Could be as simple as just a difference on RPM. A higher speed will gain HP.
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Old 06-22-2019, 03:54:21 PM
IndianaDundee IndianaDundee is offline
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Default Re: Vh4d vs W4-1770

Quote:
Originally Posted by Andrew Mackey View Post
Could be as simple as just a difference on RPM. A higher speed will gain HP.
I know that was common in the muscle car days and the W4 is rated at a higher rpm.
But it also shows more power across the powerband and more torque at a lower RPM than the VH4D.
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Old 06-22-2019, 03:56:19 PM
old sparky old sparky is offline
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Default Re: Vh4d vs W4-1770

got extra wis parts call 507 525 2345
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Old 06-22-2019, 09:07:22 PM
K-Tron K-Tron is offline
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Default Re: Vh4d vs W4-1770

The W4 was Wisconsin's answer to the EPA. Early W4's had updated valve seats, valve guides, manifolds and carburetor. Later W4's were electronically controlled and had sequential multiport fuel injection. The electronic W4s are quite rare, I have only ever seen two of them. I assume you have a carbureted W4. The pistons, connecting rods, wrist pins, and valves interchange between the carbureted W4 and the VH4D. They share the same part numbers. I am curious about your cylinder being cracked. That is extremely uncommon. Unless your cylinder jugs were bored 0.060" oversize and continental pistons fit, your cylinders should have been fine. A corresponding blown head gasket suggests that there is something wrong with your rotating assembly and your means of cooling the engine.

Chris
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Old 06-23-2019, 03:07:43 PM
IndianaDundee IndianaDundee is offline
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Default Re: Vh4d vs W4-1770

Quote:
Originally Posted by K-Tron View Post
The W4 was Wisconsin's answer to the EPA. Early W4's had updated valve seats, valve guides, manifolds and carburetor. Later W4's were electronically controlled and had sequential multiport fuel injection. The electronic W4s are quite rare, I have only ever seen two of them. I assume you have a carbureted W4. The pistons, connecting rods, wrist pins, and valves interchange between the carbureted W4 and the VH4D. They share the same part numbers.

Chris
Thank you. It is a carb, not efi, but the W4 has a side draft carb and the VH is updraft. I jut redid my updraft carb and the sidedraft manifold is cracked so even if it makes less power I will have to use the updraft. I was thinking of running the W4 cam if it was better, but I am no engine expert. No point of changing it if they are the same.

---------- Post added at 03:07:43 PM ---------- Previous post was at 02:52:35 PM ----------

Quote:
Originally Posted by K-Tron View Post
I am curious about your cylinder being cracked. That is extremely uncommon. Unless your cylinder jugs were bored 0.060" oversize and continental pistons fit, your cylinders should have been fine. A corresponding blown head gasket suggests that there is something wrong with your rotating assembly and your means of cooling the engine.

Chris
I had just got it back together after putting in some rings and replacing a main bearing. I had just adjusted the carb and was dialing in the carb when it got loud and started tossing sparks out of the air ductwork.

https://uploads.tapatalk-cdn.com/201...30379f7fe8.jpg
Not bored over either, still running standard pistons.
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Old 06-23-2019, 04:18:02 PM
Vanman Vanman is offline
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Default Re: Vh4d vs W4-1770

Might the difference in power / torque between the two just be compression ratio? Do the heads look different?

Keith
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Old 06-24-2019, 09:33:16 PM
IndianaDundee IndianaDundee is offline
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Default Re: Vh4d vs W4-1770

Figuring out how to get the picture to show.

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Old 07-01-2019, 12:15:49 AM
ArodaPowerCo ArodaPowerCo is offline
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Default Re: Vh4d vs W4-1770

Might be worth trying to fit the W4 in place of the VH4D. It will swill *slightly* less fuel.

I love these engines. I have two THDs, used to maintain a W4-1770 and V465D (on chippers). But golly-day they are the fastest way I know of to dispose of dead dinosaurs.
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Old 07-05-2019, 11:46:09 PM
IndianaDundee IndianaDundee is offline
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Default Re: Vh4d vs W4-1770

I found the difference, or at least one difference.
If you look really close there is a bump on the W4 that would slightly raise compression and could make it flow just a little better.
VH4D:

W4-1770:
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Old 07-06-2019, 12:19:24 AM
K-Tron K-Tron is offline
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Default Re: Vh4d vs W4-1770

Now this all makes sense, so are you going to replace the blown up VH4D with the W4-1770, or build the best one out of the two? I personally would not even bother rebuilding that VH4D. It is a parts engine if it can even be used as one. Bad cylinders, bad rods, a crank that needs to be turned, new pistons, gaskets, seals, bearings and who knows what and you will have two grand into your engine. If the W4 will bolt right up, pull the oil pan, make sure it is nice and clean, check the rod bearings, pull the heads, check the valves, retorque everything, and put it to use.

Chris
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Old 07-06-2019, 08:33:09 AM
IndianaDundee IndianaDundee is offline
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Default Re: Vh4d vs W4-1770

Best of both for now. Being I just went through the bottom end on the VH4D I am not worried about it. Also the W4-1770 has a magneto instead of alternator, different distributor, a different starter setup, and the fan housing is bent cracked and rewelded particularly around the starter mount. Sure I could swap out those parts, but then I am back to a mix and match engine anyway.
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